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Low-carbon multi-element high-resistance electrothermal alloy and preparation method thereof

An electrothermal alloy and high resistance technology, which is applied in the field of alloy materials, can solve the problems of urgent improvement of strength and oxidation resistance, reduction of the number of grain boundaries, serious embrittlement, etc., to improve high temperature mechanical properties and oxidation resistance, high resistance Oxidation, effect of grain refinement

Inactive Publication Date: 2016-05-11
北京中钢控股集团有限公司
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

It not only limits the scope of use, but also seriously shortens the service life
The existing iron-chromium-aluminum alloys have high carbon content and single alloying elements. After being used at high temperature, M 23 C 6 The precipitation is inevitable, especially when the alloy is used at high temperature for a long time, the grains grow very thick, the number of grain boundaries is relatively reduced, and the entire grain boundary is covered with network M 23 C 6 , the degree of brittleness is more severe
In addition, the strength and oxidation resistance of existing alloys need to be improved urgently

Method used

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  • Low-carbon multi-element high-resistance electrothermal alloy and preparation method thereof

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Embodiment Construction

[0010] Further illustrate and understand the present invention through embodiment below.

[0011] The element ratio of Examples 1-3 is shown in Table 1.

[0012] The element ratio (wt%) of table 1 embodiment 1-3

[0013]

[0014] Prepare the finished alloys of Examples 1-3 according to the following method: (1) batching: batching according to the composition of Table 1; (2) smelting: put the above-mentioned raw materials in a magnetic levitation vacuum induction melting furnace, and vacuumize to 1 × 10 -3 Pa, filled with high-purity argon to 1×10 4 Pa, melted at 2900°C and cooled with the furnace to form an alloy ingot; (3) Homogenization annealing: put the alloy ingot into a vacuum heat treatment furnace, -3 Pa, heat preservation at 1100°C for 36 hours and then cool in the furnace; (4) Isothermal forging: Process the homogenized annealed sample into a cylindrical ingot by wire cutting, and perform isothermal forging on a four-column hydraulic press; (5) Hot-rolled disc ...

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Abstract

The invention relates to an alloy material and in particular discloses a low-carbon multi-element high-resistance electrothermal alloy and a preparation method thereof. The low-carbon multi-element high-resistance electrothermal alloy comprises C, Si, Mn, Al, Cr, Co, Hf, Zr, Nb, Ti, Tb, Dy, B and Fe. The preparation method comprises the following steps: batching, smelting, performing homogenizing annealing, performing isothermal forging, performing hot rolling on wire rods, performing stress relief annealing, bleaching and performing multi-pass drawing. The prepared finished material has high toughness, high tensile strength and high oxidation resistance, overcomes the defects in the prior art and has high industrial application prospects.

Description

Technical field: [0001] The invention relates to an alloy material, in particular to a low-carbon multi-component high-resistance electrothermal alloy and a preparation method thereof. Background technique: [0002] Electrothermal alloy materials are resistance alloys that use the resistance properties of substances to manufacture heating elements. At present, the electrothermal alloy material has become an important engineering alloy material, which is suitable for machinery, metallurgy, electronics, chemical industry and other industries, and occupies an important position in the national economy. The electrothermal alloys currently used are mainly divided into two categories: iron-chromium-aluminum alloys with ferrite structure and nickel-chromium alloys with austenite structure. Iron-chromium-aluminum alloys have a series of advantages over nickel-chromium alloys, such as higher allowable service temperature , high resistivity, easy hot and cold processing, etc., but it...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/32C21D8/06
Inventor 郭健郭小芳郭乃林
Owner 北京中钢控股集团有限公司